US4444498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for measuring blood oxygen saturation
Assignee: Jostra Bentley Inc
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Filing: 1982-08-20
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Granted: 1984-04-24
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Expires: 2002-08-20
Abstract
Abstract A device and method for measuring blood characteristics and parameters, especially arterial, venous, or differential blood oxygen saturation levels uses one or two probes containing a unique configuration of light emitters of two different wavelengths, and sensors which alternately illuminate and read reflected light from blood passing through a specially-designed cuvette. Electronic comparison of reflected radiation received by the probes produces a voltage which is linearly related to blood oxygen saturation level. An opto-electronic feedback network compensates for differences in blood optical density.
Inventors
- 👤 Stanley O. Heinemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:53
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/14551; A61B5/14557; A61M; A61M1/00; A61M1/36; A61M1/3607; A61M1/3609; A61M1/361; A61M1/3612; G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/314; G01N21/3151; G01N21/84; G01N21/85; G01N2021/3144; G01N2021/3181; G01N2201/00; G01N2201/06; G01N2201/062; G01N2201/0621; G01N2201/069
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A cuvette for use in conjunction with electrooptical measurement of blood parameters, comprising: a body portion comprised of an optically clear biocompatible material; a substantially flat window area disposed in said body portion; end portions for connection to tubing or apparatus for conducting blood or other liquids therethrough; and a lightproof backing having light absorbing properties on the surface proximate to said body portion, said backing located on at least the surface of said body portion opposite said window area, but not on said window area.
Claim 2
Dependent Claim
86 words
A cuvette for use in conjunction with electrooptical measurement of blood parameters, comprising: a body portion comprised of an optically clear biocompatible material; a substantially flat window area disposed in said body portion; end portions for connection to tubing or apparatus for conducting blood or other liquids therethrough; and a lightproof backing having light absorbing properties on the surface proximate to said body portion, said backing located on at least the surface of said body portion opposite said window area, but not on said window area.
Claim 3
Dependent Claim
21 words
The cuvette of claim 1 wherein the flow path is substantially straight flow through in order to reduce cavitation and turbulence.
Claim 4
Dependent Claim
21 words
The cuvette of claim 1 wherein the sides of said body are free of said light-proof backing to permit priming inspection.
Claim 5
Dependent Claim
24 words
The cuvette of claims 1 or 2 further comprising means for optically coupling radiation sources and at least one radiation sensor to said cuvette.
Claim 6
Dependent Claim
12 words
The cuvette of claim 4 wherein said means consists of fiberoptic means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |